Download PHYS-104 - GENERAL PHYSICS BEHAVIORAL OBJECTIVES AND

PHYS-104 -
GENERAL PHYSICS
BEHAVIORAL OBJECTIVES AND ASSIGNMENTS
UNIT II (A):
(N)
STATIC ELECTRICITY (N) = No Equation Sheet;
(E) = Equation Sheet)
A.
Using the law of static charges and the principle of
conservation of charge, be able to apply it to
practical situations to identify the outcome, e.g.,
when two objects attract each other electrically, must
both of them be charged?
B.
Be able to solve Coulomb's law problems:
1.
qualitatively if one and two variables are
changed,
2.
mathematically for any one variable in terms of
the other three using correct units,
3.
stating the magnitude and direction of the
resultant force on up to four point charges at a
given location given the magnitude and distance
for each one, and
4.
equate to other forces such as gravity, etc.
(N)
C.
Be able to distinguish between conductors,
semiconductors, and insulators, re:
1.
charge bonding,
2.
physical materials involved,
3.
the electrical conduction process in solids,
liquids, gases, and plasmas,
4.
apply to explain the outcome of a practical
situation including superconductivity, and
5.
identify what is meant by grounding and explain
the outcome for practical examples.
(N)
D.
Using the nuclear model of the atom, be able to:
1.
identify its composition and the charges and their
location,
2.
identify and discuss what occurs on the atomic
level when an object receives a certain sign of
electrostatic charge, and
3.
compare the strength of electric and gravitational
forces on an atomic scale.
(N)
E.
In relation to electric fields, be able to:
1. identify its properties and rules for lines of force
and distinguish from a gravitational field.
2. sketch the field lines (lines of force) in the
vicinity of simple charged objects and explain how
they behave near point changes and near and in
metals.
3. solve for E = F/q.
(N)
(E)
PHYS 104, OBJ Unit IIA SP13
4.
(E)
(E)
F. Use Newton’s 2nd law, equations of motion, and definition of
electric field to describe the motion of charged particles
in a uniform electric field and given a vector electric
field and velocity, calculate the:
1. acceleration,
2. time to reach a velocity or distance,
3. distance charge moves in a given time interval,
4. kinetic energy, and
5. vertical displacement(given horizontal displacement
(N) G.
(N)
identify relative strength, direction of field lines
near charged bodies including spheres, and how a
charged object would behave when placed in a given
direction field.
5. correctly solve mathematical problems using proper
units and directions for the electric field at a
given point for up to four charges, given each
charge and separation distance, and a sphere, given
each charge and separation distance.
Using the principles of electric fields, i.e., field within
a metal is zero, the greater the curvature, the stronger the
field, etc.:
1. apply each to identify the solution to a physical
situation.
2. solve simple mathematical shielding problems.
H. Define electric flux and Gaussian Surface for various 2-D
and 3-D surfaces:
1. apply to explain practical situations (e.g., doubling
volume of the sphere and calculate the electric flux for
of given charge through the closed surface (e.g., sphere
of given radius, cube of given sides, etc.)
2. given E, A and the directional relationship between E
and A, calculate the flux through A.
3. state Gauss’ Law as an equation and in descriptive form:
apply to practical situations(e.g.explain its limitation
to cases where it can’t be used), and find the charge’s
sign, position, and density for a given charge within or
on a surface.
LABORATORY OBJECTIVES
A.
Be able to identify with 100% accuracy the effect of a
charged rod on:
1. small pieces of uncharged materials.
2. a like charged object,
3. an unlike charged object, and
4. touching it with your hand.
Each will be verified in lab using appropriate equipment.
PHYS 104, OBJ Unit IIA SP13
B.
Using the leaf electroscope and a charging rod, be able to
demonstrate and explain briefly, with 100% accuracy, the
physical principles behind:
1. charging by conduction (contact),
2. induced charge, and
3. charging by induction.
C.
Be able to identify, with 100% accuracy, the effect of an
object's curvature on the charge concentration. This will
be verified in lab using the electrostatic generator and
objects of different curvature.
D.
Identify, with 100% accuracy, the effect of force of
repulsion (attraction) between two like (unlike) charged
bodies with:
1.
2.
amount of charge, and
separation distance.
Each will be verified in lab using a pith ball, rubbing fur
or cloth, and a plastic rod.
E.
Apply physical principles learned in Objective A-D to
explain practical situations, e.g., why a plastic comb
rubbed through your hair sticks to it on a dry day.
Learning Activities for Static Electricity (Electrostatics)
Read: College Physics,9th ed. Serway,etc. Chapter 15 (all pages).
College Physics, 11th ed. (Schaum's Outline), pages 268-275
(pps. 241-248 in 10th ed).
Optional:
Homework:
Conceptual Physics, pages 410-425 in 10th ed.(pages
412-428 in 9th edition) on reserve in the Library.
The Physics Toolbox..,pps. 126-128, 334-342 (vector
review)
Chapter 15: MC Q’s 4(calculate), 8(calculate), 9 & 12; Concept
Q’s 1, 4, 6, 8, 14 and
1.
How can the principle of charge conservation be reconciled
with the fact that a rubber rod can be charged by stroking
it with a piece of fur?
Problems: 2, 6, 9, 10(6uC only), 11, 13, 15*, 18, 23, 30, 33,
34(c) & (d), 41, 43, 46 & 57*
*More difficult, so don't lose any sleep over it if you can't
solve them.
Answers to selected even-numbered Problems:
2. 1.57 N toward A
6. 2.25 x 10-9 N/m
30. discuss in class
7
2
46(a) 1.92 x 10 Nm /C
b. 3.2 x 106 Nm2/C c.(b) change and
(a) unchanged
PHYS 104, OBJ Unit IIA SP13
Audio-Visual:
Video: Electricity: "Introduction to Electrostatics," "Charge
Distribution: Concentration and Point Discharge," and "Van de
Graaf Generator"
Fields around Point Charges (22 min) shown in lab
Laboratory:
Electrostatics and Van de Graaf Generator Demos
Superconductivity Demo
Fields and Equipotential
PHYS 104, OBJ Unit IIA SP13